Ingress controllers (Nginx, Traefik) in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an Ingress controller in Kubernetes?

An Ingress controller is a component that manages external access to services inside a Kubernetes cluster, usually HTTP and HTTPS traffic, by processing Ingress resource rules.

beginner

Name two popular Ingress controllers used in Kubernetes.

Nginx and Traefik are two popular Ingress controllers used to route traffic into Kubernetes clusters.

intermediate

How does Nginx Ingress controller handle traffic routing?

Nginx Ingress controller uses Nginx as a reverse proxy to route incoming requests based on host and path rules defined in Ingress resources.

intermediate

What is a key feature of Traefik Ingress controller compared to Nginx?

Traefik supports dynamic configuration and automatic service discovery, making it easier to manage routes without restarting the controller.

beginner

Why is an Ingress controller important for Kubernetes applications?

It provides a simple way to expose multiple services under the same IP address and domain, handling SSL termination and load balancing efficiently.

What does an Ingress controller primarily manage in Kubernetes?

A Cluster node health

B Internal pod communication

C External HTTP/HTTPS traffic routing

D Storage volumes

Ingress controllers manage external HTTP and HTTPS traffic routing into the cluster.

Which Ingress controller uses Nginx as its core proxy server?

A Linkerd

B Traefik

C Istio

D Nginx Ingress controller

The Nginx Ingress controller uses Nginx as the reverse proxy to route traffic.

What feature makes Traefik Ingress controller easier to configure dynamically?

A Automatic service discovery

B Manual config reloads

C Static configuration files

D No SSL support

Traefik supports automatic service discovery, allowing dynamic route updates without restarts.

Which of these is NOT a function of an Ingress controller?

A Pod scheduling

B SSL termination

C Load balancing

D Path-based routing

Pod scheduling is handled by Kubernetes scheduler, not the Ingress controller.

How does an Ingress controller help with exposing multiple services?

A By assigning each service a unique IP

B By routing traffic based on host and path rules

C By creating new pods for each service

D By managing storage volumes

Ingress controllers route traffic to different services using host and path rules under the same IP.

Explain what an Ingress controller does in Kubernetes and why it is useful.

Think about how users access apps inside the cluster from outside.

Compare Nginx and Traefik Ingress controllers in terms of configuration and features.

Focus on how each controller updates routes and manages services.